Imodyuli yeSilicon ye-FMCW

Imodyuli yeSilicon ye-opticalye FMCW

Njengoko sonke sisazi, enye yezona zinto zibalulekileyo kwiinkqubo zeLidar ezisekwe kwi-FMCW yimodyuli ephezulu yomgca. Umgaqo wayo wokusebenza uboniswa kulo mzobo ulandelayo: UkusebenzisaImodyuli yeDP-IQisekelweukumodareyitha kwebhanti enye (SSB), phezulu nasezantsiMZMsebenza kwindawo engenanto, endleleni kwaye phantsi kwebhendi yecala le-wc + wm kunye ne-WC-WM, i-wm yi-modulation frequency, kodwa kwangaxeshanye itshaneli esezantsi yazisa umahluko wesigaba se-90, kwaye ekugqibeleni ukukhanya kweWC-WM irhoxisiwe, kuphela ixesha lokutshintsha rhoqo kwe-wc+wm. KuMzobo b, i-LR eluhlaza okwesibhakabhaka ngumqondiso we-chirp we-FM wendawo, i-RX i-orenji ngumqondiso obonakalisiweyo, kwaye ngenxa yesiphumo se-Doppler, isignali yokubetha yokugqibela ivelisa i-f1 kunye ne-f2.

Umgama kunye nesantya zezi:

Eli lilandelayo linqaku elipapashwe yiYunivesithi yaseShanghai Jiaotong ngo-2021, malungaSSBiijeneretha ezisebenzisa FMCW ngokusekelweiimodyuli zokukhanya ze-silicon.

Ukusebenza kwe-MZM kuboniswa ngolu hlobo lulandelayo: Umahluko wokusebenza kweemodyuli zengalo eziphezulu nezisezantsi zinkulu. Umlinganiselo wokulahlwa kwe-sideband ye-carrier yahlukile kunye nereyithi yokumodareyitha rhoqo, kwaye umphumo uya kuba mbi ngakumbi njengoko ubuninzi benyuka.

Kulo mfanekiso ulandelayo, iziphumo zovavanyo lwenkqubo ye-Lidar zibonisa ukuba i-a / b isignali yokubethelwa kwisantya esifanayo kunye nemigama ehlukeneyo, kwaye i-c / d isignali yokubetha kumgama ofanayo kunye nezantya ezahlukeneyo. Iziphumo zovavanyo zifikelele kwi-15mm kunye ne-0.775m / s.

Apha, kuphela ukusetyenziswa kwe-siliconimodyuli yokubonakuba FMCW kuxoxwe ngayo. Ngokwenyani, isiphumo se-silicon optical modulator ayilunganga njengaleyoImodyuli yeLiNO3, ikakhulu ngenxa yokuba kwi-silicon optical modulator, utshintsho lwesigaba / i-absorption coefficient / junction capacitance ayihambelani nokutshintsha kombane, njengoko kubonisiwe kumzobo ongezantsi:

Yiyo i,

Ubudlelwane bamandla emveliso yeimodyuliinkqubo imi ngolu hlobo lulandelayo
Isiphumo lulungiselelo oluphezulu lokumiswa:

Oku kuya kubangela ukwandiswa komqondiso wefrikhwensi yokubetha kunye nokuncipha komlinganiselo wesignali ukuya kwingxolo. Ke yeyiphi indlela yokuphucula umgca we-silicon modulator yokukhanya? Apha sixoxa kuphela ngeempawu zesixhobo ngokwazo, kwaye musa ukuxoxa ngeskimu sembuyekezo usebenzisa ezinye izakhiwo ezincedisayo.
Esinye sezizathu zokungahambelani kwesigaba sokumodareyitha kunye ne-voltage kukuba indawo yokukhanya kwi-waveguide ikukusabalalisa okwahlukileyo kweeparitha ezinzima kunye nezilula kwaye izinga lokutshintsha kwesigaba lihluke ngokutshintsha kwamandla ombane. Njengoko kubonisiwe kumfanekiso olandelayo. Ummandla wokunciphisa kunye nokuphazamiseka okunzima utshintsha ngaphantsi kunokuphazamiseka kokukhanya.

Lo mzobo ulandelayo ubonisa iijika eziguqukayo ze-TID yokuphazamiseka kwe-intermodulation yesithathu kunye ne-second-order harmonic distortion SHD kunye noxinaniso lwe-clutter, oko kukuthi, i-modulation frequency. Ingabonwa ukuba isakhono sokucinezela ukudityaniswa kwe-clutter enzima iphezulu kuneyoku-clutter ekhanyayo. Ngoko ke, ukuxutywa kwakhona kunceda ukuphucula umgca.

Oku ngasentla kufana nokuqwalasela i-C kwimodeli ye-RC ye-MZM, kwaye impembelelo ye-R kufuneka iqwalaselwe. Oku kulandelayo yinguqu yenguqu ye-CDR3 kunye nokumelana nochungechunge. Inokubonwa ukuba incinci ukuchasana kochungechunge, inkulu i-CDR3.

Okokugqibela kodwa kuncinci, isiphumo semodyuli ye-silicon ayibi kakhulu kuneLiNbO3. Njengoko kubonisiwe kulo mzobo ungezantsi, CDR3 yeimodyuli yesiliconiya kuba phezulu kuneLiNbO3 kwimeko yokungakhethi ngokupheleleyo ngoyilo olufanelekileyo lwesakhiwo kunye nobude bemodyuli. Iimeko zovavanyo zihlala zingatshintshi.

Isishwankathelo, uyilo lolwakhiwo lwemodyuli yokukhanya ye-silicon inokuncitshiswa kuphela, inganyangeki, kwaye ingaba ingasetyenziswa ngokwenene kwinkqubo ye-FMCW ifuna ukuqinisekiswa kovavanyo, ukuba ngaba inokuba yinyani, ke inokufikelela ukuhlanganiswa kwe-transceiver, enenzuzo. ukuze kuthotywe iindleko ezinkulu.